Method to prepare haydite concrete mix

FIELD: construction.

SUBSTANCE: in the method to prepare a haydite concrete mix, including preparation and mixing of mixture components, mixing of the haydite concrete mix is carried out in a turbulent concrete mixer with rotor rotation frequency of at least 8 sec-1 and not more than 30 sec-1, at first 30% of required tempering water is supplied into the turbulent concrete mixer, and gradually haydite gravel is loaded with the running turbulent mixer, and mixed for 120 sec., then the required balance of water is supplied to the continuously running turbulent concrete mixer with addition of technical modified lignosulphonates and a gas forming additive PAK-3, then fly ash and cement are loaded, and the mix is mixed for 2-3 min. to produce homogeneous mix with required cone slump, at the following ratio of components, wt %: portland cement 20.00, haydite 41.50, superplasticiser LSTM 0.0312, fly ash of TPP 17.50, PAK-3 0.025, water - balance.

EFFECT: reduced process operations in production of haydite mix, increased frost resistance, heat insulation properties and reduced average density of haydite without strength reduction.

2 tbl

 

The invention relates to the construction materials industry, in particular to a technology for manufacturing lightweight aggregate mixtures, resource-saving technologies of the lightweight concrete.

There is a method of production of cellular concrete mixture (Patent No. 2474493, IPC VS 5/00, publ. 10.02.2013), which includes preparation and mixing in the mixer Portland cement, lime with a known value of enthalpy, gypsum, water, siliceous component, reverse slag, aluminum powder, measuring the temperature of the mixture in the mixer during mixing, discharging the mixture from the mixer to the form.

The disadvantage of this method is the large number of technological operations, the complexity of the mixture.

A method of obtaining concrete (Patent No. 2470901, IPC SW 40/00, SW 28/26, SW 111/20 publ. 27.12.2012), including the preparation of aluminosilicate binder component, the dosage of filler and binder components, mixing, molding, curing and subsequent hardening. Preparation of aluminosilicate component includes a joint grinding in a ball mill ash and moldboard ash mixture for 20 min, the molding is carried out by vibrating.

The disadvantage of this method is the large number of technological operations.

The known method betablocking manufacturing gas is of concrete construction products (Patent No. 2083535, IPC SW 38/02, SW 28/18, SW 1/50 publ. 10.07.1997), which includes the concrete mix in the mortar by mixing Senatorova binder, silica filler (silica sand or coal ash) and water, followed by the introduction into the concrete mixture of blowing agent and mixing to obtain a concrete mixture, molding casting concrete mixture obtained in the form and curing products under the action of hydrothermal treatment in the steam chamber steam low pressure.

The disadvantage of this method is the large number of technological operations, allowing us to obtain concrete of the required quality.

The technical result of the claimed invention is the reduction of technological operations in the production of concrete mixture with the required technological, and further operational properties of claydite-concrete.

The technical result is achieved in that for the manufacture of concrete mixtures, including the preparation and mixing of the mixture components in the following ratio, wt.%: Portland 20.00, clay 41,50, superplasticizer LSTM 0,0312, ash CHP 17,50, PAK-3 0,025, water - the rest, according to the invention, using a turbulent mixer with a rotor speed of not less than 8 sec-1 -1. First in a turbulent mixer serves 30% of the required quantity of the mixing water and load gradually expanded clay gravel when working turbulent mixer with crushing clay gravel and its activation within 120 seconds, next in continuously working turbulent mixer, submit the required balance of water with the addition of lignosulfonates modified (hereinafter superplasticizer LSTM) and gas-forming additives PAK-3 (PAC-3), then load the fly ash and Portland cement, and stirred the mixture for 2-3 minutes until a homogeneous mixture with a desired slump.

The use of turbulent mixer with a rotor speed of not less than 8 sec-1and not more than 30 sec-1promotes partial crushing clay gravel. When crushing clay gravel is the exposure of new surfaces clay gravel that contain free radicals with unsaturated valency. These free radicals actively interact with minerals in Portland cement clinker with the formation of new chemisorption compounds on the surface of the grains of expanded clay gravel. These new chemisorption compounds are strongly held on the surface of clay gravel and the surface of the grains of Portland cement, the resulting improved strength and other physical and mechanical properties of claydite-concrete. Optimal crushing limestone for 120 sec together with 30% of the required quantity of the mixing water.

Mixing concrete mixture in a turbulent mixer for 2-3 min has an activating effect on the fly ash, which is loaded together with Portland cement after you add the rest of water with the addition of superplasticizer LSTM and PAC-3. Spherulites fly ash subjected to partial fragmentation, and expose the surface of the fly ash containing silica and alumina. These oxides actively interact with the calcium hydroxide produced during the hydration of tricalcium silicate with slightly basic education hydrosilicates and hydroalumination calcium, which significantly improves hydrophysical properties of claydite-concrete.

The use of turbulent mixer to obtain a concrete mixture has an activating effect on grain Portland cement. Intensive mixing in a turbulent mixer activates grain of Portland cement due to their partial crushing, thus expose new surfaces of UN-hydrated Portland cement grains. These surfaces having free radicals, actively engage in the processes of hydration intensive formation of new hydrated compounds. Introduction to ceramsite the traditional mix of PAC-3 leads to the formation of the structure of cement stone with uniformly distributed pores in the form of a polydisperse in size, closed, deformed in the right polyhedra with glossy surface preparepage layer, separated by a thin, but dense and uniform in cross-section interporous partitions (an Additive in concrete and mortars: training Handbook / L. I. Kesternich. - Rostov-on-don: Phoenix, 2007). Such a pore structure concrete mixture helps to increase the insulation properties of expanded clay concrete and improve the physico-mechanical properties of the obtained claydite-concrete.

The use of turbulent mixer also contributes to the activation of the blowing agent, which leads to the formation of a large pore volume of concrete mix and lower average density concrete mixture without reducing the strength of the system. Thus, the use of turbulent mixer for the manufacture of concrete mix allows you to get the expanded-clay lightweight concrete with high performance properties.

Table 1
The composition of concrete mixtures
ComponentsContent, wt.%:
Composition No. 1Composition No. 2 (the optimum) Composition No. 3
Portland15,0020,0023,00
Leca40,0041,5044,00
Ash CHP21,5017,5015,50
Superplasticizer LSTM0,03120,03120,0312
Gas-forming additive PAK-30,0250,0250,025
Water23,44420,94417,444
The average density, kg/m3121010001130
The strength of claydite-concrete, kg/cm2 759590
Frost (F), cycle152020

The technical result of the claimed invention was achieved on concrete samples with the following composition: Portland cement, limestone, fly ash CHP, PAK-3, superplasticizer LSTM in the following ratio, wt.%: Portland 20,00; clay 41,50; superplasticizer LSTM 0,0312; ash CHP 17,50; PAK-3 0,025; water - the rest.

The dependence of the characteristics of the samples prepared with different ways of mixing parameters from mixing concrete mixtures are presented in table 2.

Table 2
The parameters of mixing in turbulent mixer.
Comparative characteristicsMethod of preparation mix
No. 1No. 2No. 3 (optimal)
The frequency of BP is in the rotor, s-17,07,58,0
Time crushing and mixing the clay with water, sec150135120
While stirring the mixture with fly ash, superplasticizer LSTM and PAK-3, min543
The average density, kg/m3125011501000
The strength of claydite-concrete,859095
kg/cm2
Frost (F), cycle152020

Table 2 is about, that way the mixture with optimal parameters is the way to No. 3. Comparing between the characteristics of the concrete samples prepared in different ways, we can conclude that with decreasing rotor speed average density increases and strength decreases. Even with increasing time crushing and mixing this dependence varies slightly. Therefore, the application of concrete mixer with rotor speed 8 sec-1and not more than 30 sec-1(with a corresponding reduction in mixing time in a concrete mixture in the installed above the framework) is the most effective for the given concrete mixture.

The method of preparation of the concrete mixture, which includes preparation and mixing of the components of the mixture, wherein the mixing of the concrete mixture is performed in a turbulent mixer with a rotor speed of not less than 8 sec-1and not more than 30 sec-1first in a turbulent mixer serves 30% of the required quantity of the mixing water and load gradually expanded clay gravel when working turbulent mixer and stirred for 120 seconds, then, non-stop working turbulent mixer, submit the required balance of the odes with the addition of lignosulfonates modified and gas-forming additives PAK-3, then download the fly ash and cement, and stirred the mixture for 2-3 minutes until a homogeneous mixture with a desired slump, in the following ratio, wt.%: Portland 20.00, clay 41,50, superplasticizer LSTM 0,0312, ash CHP 17,50, PAK-3 0,025, water - the rest.



 

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